<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" label-width="0px" class="login_form" :model="loginForm" :rules="loginRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
            <el-input placeholder="请输入用户名" prefix-icon="iconfont icon-user" v-model="loginForm.username">
            </el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
            <el-input placeholder="请输入密码" prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password">
            </el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="reset">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 数据对象与表单绑定
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则
      loginRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置按钮
    reset () {
      // this.$refs.loginFormRef获取到当前ref所在表单的实例对象
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // ref所在表单的实例对象验证 valid接收boolean值
      this.$refs.loginFormRef.validate(async valid => {
        // 如果没通过
        if (!valid) return
        // 通过后用res接收请求返回的对象中的data属性
        const { data: res } = await this.$http.post('login', this.loginForm)
        // 通过响应码进行弹窗提示
        if (res.meta.status !== 200) return this.$message.error('登录失败，请重试')
        this.$message.success('登录成功')

        // 将登录成功后的token保存到sessionStorage中(只在当前网站打开时生效)
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到后台路由'/home'
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  position: absolute;
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
//默认头像
.avatar_box {
  position: absolute;
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  box-shadow: 0px 3px 3px #ddd;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}
// 表单
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 10px;
    box-sizing: border-box;

}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
